How much was lost in the CREAM Lending hack?

The CREAM Lending hack resulted in $130M in losses on October 27, 2021.

What attack technique was used in the CREAM Lending exploit?

The CREAM Lending exploit utilized Flashloan Price Oracle Attack. Understanding this attack vector is critical for smart contract auditors and developers building secure DeFi protocols.

How can developers prevent similar smart contract attacks?

Preventing smart contract hacks requires a combination of secure coding practices, thorough security audits, and understanding common attack vectors like reentrancy, oracle manipulation, and access control flaws. Smart Contract Hacking (SCH) provides hands-on training to help developers and auditors identify and prevent vulnerabilities before deployment.

CREAM Lending Hack

TOTAL LOST $130M

Critical #65 All-Time Oct 27, 2021 Flashloan Price Oracle Attack ethereum

Affected Chain ethereum Incident surface

Recovered - No recovery reported

All-Time Rank #65 By amount stolen

Auditors 1 Prior security audit

Incident Overview

Money markets, liquid staking and protocol-to-protocol lending

This is classified as a Flash Loans Attacks, Oracle Manipulation & Price Manipulation . Compare similar hacks →

Incident Report

Protocol / Project CREAM Lending

Date of Incident October 27, 2021

Affected Chain(s) ethereum

Attack Technique Flashloan Price Oracle Attack

Classification Ecosystem

Primary Source View Post-Mortem

Protocol Information

Protocol Type Lending

Smart Contract Language Solidity

Official Website cream.finance/

Protocol Twitter/X @CreamdotFinance

What the Attacker Needed to Succeed

Understanding the prerequisites for this type of attack helps auditors identify protocols that are most at risk and helps developers build better defenses.

Technical Knowledge Deep understanding of flashloan price oracle attack and Solidity and EVM internals

Capital Required Seed capital to cover gas and initial position setup

On-Chain Access Ability to interact with ethereum smart contracts and deploy a custom exploit contract

Protocol Analysis Identification of the exploitable vulnerability in CREAM Lending's contract logic - root cause: ecosystem

Execution Speed Precise transaction ordering and timing to exploit the vulnerability within a single atomic block

Obfuscation Plan A strategy to launder and move stolen funds - typically through mixers, cross-chain bridges, or decentralized DEX swaps to resist tracing

What Auditors Should Check

Could this have been caught in audit? Yes — skilled auditors routinely flag Flashloan Price Oracle Attack vulnerabilities in code review

Audited by Audit Report 1 — still lost $130M. Prior audits don't guarantee safety, especially after post-audit code changes.

If you're auditing a protocol with similar architecture to CREAM Lending, these are the critical security checks that could have prevented this incident (October 2021).

Verify all logic paths related to Flashloan Price Oracle Attack are guarded by proper access controls and input validation - see the Flash Loans Attacks attack class for patterns
Audit oracle price feeds for manipulation risks - ensure time-weighted average prices (TWAPs) or multi-source aggregators are used, not spot prices
Review privileged functions (owner, admin, governance) for potential abuse vectors - centralization risks should be documented and bounded with timelocks or multi-sigs

Master these auditing techniques with hands-on labs and real exploit scenarios in the Smart Contract Hacking course.

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Security Audit History

Audit Report 1 Report

Related Attack Classes

The technique used in this hack maps to these vulnerability classes in our security curriculum:

See all Flash Loans Attacks examples →

Flash Loans Attacks Oracle Manipulation & Price Manipulation

Sources & References

01
Source 1 https://rekt.news/cream-rekt-2/

Threat Assessment

Severity Level

CRITICAL

Attack Vector Flashloan Price Oracle Attack
Root Cause Ecosystem
Year 2021

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